United States. Bureau of Labor Statistics.
Wages and Tips in Restaurants and Hotels, March 1970 : Bulletin of the United States Bureau of Labor Statistics, No. 1712 ,
Washington, D.C:
For sale by the Superintendent of Documents, U.S. Government Printing Office,
1971, https://fraser.stlouisfed.org/title/4916,
accessed on August 14, 2018.